package main

import (
    "fmt"
)
func main() {
//演示二维数组的遍历
    var arr3 = [2][3]int{{1,2,3},{4,5,6}}
    //for循环来遍历
    for i :=0;i  len(arr3);i++{
        for j:=0;j  len(arr3[i]);j++{
            fmt.Printf("%v\t",arr3[i][j])
        }
        fmt.Println()
    }

    //for-range来遍历二维数组
    for i,v :=range arr3{
        for j,v2 :=range v{
            fmt.Printf("arr3[%v][%v]=%v \t",i,j,v2)
        }
        fmt.Println()
    }
}

package main //必须有个main包
 
import "fmt"
 
func main() {
    //有多少个[]就是多少维
    //有多少个[]就用多少个循环
    var a [3][4]int
 
    k := 0
    for i := 0; i  3; i++ {
        for j := 0; j  4; j++ {
            k++
            a[i][j] = k
            fmt.Printf("a[%d][%d] = %d, ", i, j, a[i][j])
        }
        fmt.Printf("\n")
    }
 
    fmt.Println("a = ", a)
 
    //有3个元素，每个元素又是一维数组[4]int
    b := [3][4]int{{1, 2, 3, 4}, {5, 6, 7, 8}, {9, 10, 11, 12}}
    fmt.Println("b = ", b)
 
    //部分初始化，没有初始化的值为0
    c := [3][4]int{{1, 2, 3}, {5, 6, 7, 8}, {9, 10}}
    fmt.Println("c = ", c)
 
    d := [3][4]int{{1, 2, 3, 4}, {5, 6, 7, 8}}
    fmt.Println("d = ", d)
 
    e := [3][4]int{1: {5, 6, 7, 8}}
    fmt.Println("e = ", e)
}